Page, Wolfberg & Wirth (PWW) was asked by the National EMS Information System (NEMSIS) Technical Assistance Center (TAC) to offer our opinion regarding the bidirectional sharing of patient information between Emergency Medical Services (EMS) and other healthcare providers. Many hospitals have raised concerns under the Health Insurance Portability and Accountability Act (HIPAA) about sharing of patient information with EMS, hindering EMS agencies’ ability to conduct meaningful quality assurance and quality improvement of their prehospital care. This paper discusses why HIPAA does not restrict, and how the law promotes, bidirectional sharing of patient information between hospitals and EMS agencies.